PROBLEM TO BE SOLVED: To provide an oxygen-based oxidizing composition having excellent oxidation power.SOLUTION: An oxidizing composition comprises (A) specific ethylenediamine derivative, (B) specific cationic surfactant, (C) one or more compound selected from the group consisting of organic peracid precursor and organic peracid, and (D) one or more compound selected from the group consisting of hydrogen peroxide, and peroxide that generates hydrogen peroxide underwater.